Compensatioi



`LEWIS SMITH,Y on BUFFALO, NEW YORK.

coMPENsaTIoNLBEARINe.

t To all whom it may concern:

j i Be it known that I, LEWIS SMITH, of Buffalo, in the county of Erieand Stateof New York, have invented ua new and Improved Mode of Constructing Bearings for Ma? "chinery, which "is described and set forth in l. the following specicationand accompanying drawings with suiiicient clearness to `ent able others of competent skill tofmakeand f w use my invention.

` It is a well known fact that the metal of which` `gibs and bearing boxes for journals are usually composed `expands much more by heat than the iron crossheads or pillowi consequently that" abearing of this 'kind t keyed up` to its propertightness when cold f becomes too tight as soon as the box or gib becomes worn from runningwhich` increases the tightness' and causes `more frictionand thatjin turn, a greaterheat and tightness ftill the bearing `surfaces are in many cases @very much damaged or destroyed.` y f My `invention consists in methods `of construction which causes the heatof the bearcombination of metals of different expansibility as herein set forth.

j In the accompanying drawingsV Figure l is a sectional perspectiveview of a part of the principles of my invention. Fig. 2 is a vertical longitudinal sect-ion of one of the j gibs. Fig. 3, is a light transversesection of `the same gib. Fig. 4.-`is a Vertical projec- `tion `of 'a journal box embodying the same principle of construction, the plane of projection being transverse to the axis of the journal. Fig. 5 is also avertical projection of' the same. journal box, the plane of projection in this figure being parallel to the axis of the journal. Fig. 6 is a vertical sectional projection of avbearing-.suitable for a mandrel of a turninglathe or machinery of a similar nature.

l .t Specification of Letters Patent No; 12,732, dated April 17, 1855.

lfblockswhich conne them in position and' ing to relieve it of undue tightness bythe acrosshead with `a pair of gibs embodyingV A A A is part of a cross head of an engine.

diately forward of the pieces D, D, andin Fig. `3 as being cut atthe joint between them.

A fiat piece of metal E rests upon the `pieces D, D, against which piece E the set screw F is screwed down to adjust the gib to the slide; the upper jaw of the crosshead being represented as cut through at the center of this set screw so as to givea better view of the `gib and its appendages. A recess is cut and tted' in the jaw of the cross head totA receive the partsD, D, and keep place.

It will'ibe seen by the foregoing descrip- `tion and an examination of the drawings that if the brass should bear too heavily on the `slide the heat produced by undue 'friction would instead `of tightening yit rei lieve it yfrom pressure as the brass of which the gib is made would expand more than the ironpieces D, D, and thus allow the toggle joint which those pieces form to straighten and the gib to move vaway from,`

the slide. Figs. 4 and 5 show the same principle of construction applied to journal boxes. Y f

` II is onehalf of a journal box.

I is a piece of iron or steel which performs the same duty in connection with the boxl that thepieces D perform in connection with the gib; the cap or strap (as the case may be) which holds the piece H in its place resting upon the piece I instead of the box, the iron, as will be seen, rising above the brass `for that purpose, in which case the expansion of the brass will allow the crown of it to retire toward the piece I. Fig. 6 shows a method of applying this principle to `relieving thebearings at the" ends of lathe mandrels, and similar journals.

` J is a lathe mandrel or journal of similar description. It has a conical hole in the end toA receive the center K. This center K is split by a thin slot at the end which enters them in4 allowy the parts to spring together if hard pressed. The end of this center as will be seen in the drawing has less taper than the hole in the mandrel, so that pressing the shaft against this center with any considerable force will press the shaft J against the collar O, to which position it may be adjusted to run. If it should'be too tightly adjusted, the friction `will be likely to heat the collar-'0, which being thus caused to expand is by that means allowed to slide ing the oil in the center pin K, and excluding the atmosphere from it.

I claim- Relieving bearings of machinery from undue pressure and consequent friction by means of the different expansion of two or more different metals, the parts being constructed, combined, and operating substan tially as herein set forth or in any other manner substantially the same;

LEWIS SMITH,

Witnesses:

M. E. BROWN, THos. R HOW. 

